view tests/test-issue4074.t @ 42478:561cd02c58ff

cat: don't prefetch files unless the output requires it

It's a waste to cache lfs blobs when cat'ing the raw data at best, but a hassle
debugging when the blob is missing.  I'm not sure if there are other commands
that have '{data}' for output, and if there's a general way to prefetch on that
keyword.

It's interesting that the verbose output seems to leak into the JSON output, but
that seems like an existing bug.

#require no-pure

A script to generate nasty diff worst-case scenarios:

  $ cat > s.py <<EOF
  > import random
  > for x in range(100000):
  >     print
  >     if random.randint(0, 100) >= 50:
  >         x += 1
  >     print(hex(x))
  > EOF

  $ hg init a
  $ cd a

Check in a big file:

  $ "$PYTHON" ../s.py > a
  $ hg ci -qAm0

Modify it:

  $ "$PYTHON" ../s.py > a

Time a check-in, should never take more than 10 seconds user time:

  $ hg ci --time -m1
  time: real .* secs .user [0-9][.].* sys .* (re)